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Onan W2C Fairbanks Morse Repair


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  #31  
Old 12-30-2017, 08:52:31 AM
AngrySailor AngrySailor is offline
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Default Re: Onan W2C Fairbanks Morse Repair

With noting to lose I guess I'll bake it, clean it up and braze it...
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  #32  
Old 12-30-2017, 09:54:33 AM
EnginePat EnginePat is offline
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Default Re: Onan W2C Fairbanks Morse Repair

Mm baked cylinders for breakfast!
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  #33  
Old 12-30-2017, 10:03:19 AM
AngrySailor AngrySailor is offline
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Default Re: Onan W2C Fairbanks Morse Repair

COME AND GET IT! Heading to my friends shop to do some brazing soon. Might land on the mill later if all goes well.
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  #34  
Old 12-30-2017, 03:50:16 PM
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Default Re: Onan W2C Fairbanks Morse Repair

Crap, just got the cylinders blazed up, they were cracked pretty bad. After getting back to my shop I noticed the rib in the block between the cylinders which won't clear the build up from the brazing! Damn it!
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Old 12-30-2017, 04:10:04 PM
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Default Re: Onan W2C Fairbanks Morse Repair

Quote:
Originally Posted by AngrySailor View Post
Crap, just got the cylinders blazed up, they were cracked pretty bad. After getting back to my shop I noticed the rib in the block between the cylinders which won't clear the build up from the brazing! Damn it!
Sadly, I question how reliable the repairs will be after a few heat/ cool cycles.
I think the block is the same in all W series- W2, W3.
Consider putting an ad in the classified section of Stack, and see if anyone has a good block & piston.
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  #36  
Old 12-30-2017, 04:14:43 PM
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Default Re: Onan W2C Fairbanks Morse Repair

That would be the better option... I think the braze would hold up though given that it's the bottom of the cylinder and water temp never exceeds 212* and that would be up in the cylinder head if it even gets that hot???
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Old 12-30-2017, 06:52:31 PM
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Default Re: Onan W2C Fairbanks Morse Repair

Here's the jugs after milling the braze down. Uncovered some porosity
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  #38  
Old 01-04-2018, 06:20:41 PM
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Default Re: Onan W2C Fairbanks Morse Repair

I had her holding good pressure test then realized the repair couldn't be proud of the gasket surface... ground it down a couple times and tried with brass but still had a couple pin holes. Laid some lead over top today. Holding 20psi now. Oh and it's storming to beat the band outside. Got storm chips, storm beers, generator fuel. Gonna need it id say!
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  #39  
Old 01-13-2018, 05:15:28 PM
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Default Re: Onan W2C Fairbanks Morse Repair

Draw filed the lead down flush then run some sand paper on a square bar over it till flush still holding 20psi. The mating surface to the crankcase has a bridge between the cylinders that is flush with the mating surface. I think making a gasket with this centre bridge would be some extra insurance in case of any pin holes. Also with a non or low pressure rad cap I hope it will hold up.

If I can't get a piston I think my only option is to run the existing piston with only the top compression run and the oil ring as the other two compression rings would be unsupported due to the broken ring land. One good ring in a good bore is surely better than the rusty bore it was running with but would like to have it right.

I'd like the unit to run for shows and display but also would like it reliable to use when needed. Realistically it won't rack up a lot of hours though.
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Old 01-13-2018, 08:10:38 PM
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Elden DuRand Elden DuRand is offline
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Default Re: Onan W2C Fairbanks Morse Repair

If you were to measure the diameter of the piston, the length of the piston, the compression distance (the distance from the center of the wrist pin to the piston head) and the diameter of the wrist pin and post them, I'll almost bet someone here will have a book that will give a cross for it.

You might find that there was another, more common, engine that used an identical piston. Additionally, you just might be avle to get a pair of new ones with pins and rings at a reasonable price.

Worth a shot.
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